多樣產品生產系統含可調整的生產速率及報廢品之最佳共同週期和配送策略與含當機、可調整生產速率和報廢品之最佳生產週期

Optimal Common Cycle and Delivery Policy for a Multi-item Production System with Adjustable Production Rate and Scrap, and an Optimal Production Cycle with Breakdown, Scrap and Adjustable Production Rates

黃怡靜(YI-JING HUANG)

指導教授 ： 邱元錫

朝陽科技大學/理工學院/工業工程與管理系/碩士(2019年)

摘要

本研究探討方向分為兩種模式：模式一探討生產多樣產品考慮「可調整的生產速率」及「不良品全數報廢」之最佳共同週期與配送策略。模式二探討生產單一產品考慮「隨機性當機」、「可調整的生產速率」及「不良品全數報廢」之最佳生產週期。在傳統的經濟生產批量(Economic Production Quantity)並未考慮到設備可能發生隨機性當機，也沒有考慮生產過程中會產出不良品，且生產速率為固定的、連續型生產配送方式。
為了更符合現實生產情形，本研究在模式一假設下探討多樣產品可調整的生產速率且不良品全數報廢之最佳共同週期與配送策略，配送則採用兩種方式分別為：(1)連續配送和(2)多次配送。在現實生產中為了縮短生產完成時間、提高設備使用率等，廠商選擇調整機器的生產速率或是增加部分工時來因應需求。因此，本研究模式一假設調整機台生產速率、提升每天工作班次或增加部分工時對於生產單位成本及設置成本之變動關係。
模式二為假設探討生產單一產品可能發生隨機性當機的情形，若發生當機時，立即採用AR(About/Resume)策略，亦即設備當機後即刻修復，修復完成後立即生產未完成的批量，且生產過程中產出的不良品將全數報廢，亦考慮調整機台生產速率、提升人員工作班次或增加部分工時，對於生產單位成本及設置成本之變動關係的連續配送策略模式。最後針對上述兩種模式提出數值例子加以證明，並對相關參數值進行敏感度分析。

關鍵字

多樣產品 ； 可調整生產速率 ； 隨機性當機 ； 報廢品 ； 配送策略 ； 最佳共同週期 ； 最佳生產週期

並列摘要

This study explores the optimal common cycle and delivery policy for a multi-item production system with adjustable production rate and scrap; and the optimal production cycle for a system with random breakdown, scrap and adjustable production rates. Traditional economic production quantity (EPQ) assumed a perfect production process with no breakdown occurrences and no defects, fixed production rate, and continuous delivery plan.
However, the assumption of EPQ model is too simple to fit the needs of real life situations. In order to cope with the real production situations, the proposed model 1 studies the optimal common cycle for multi-item production systems with all of defective items are scrapped and considering two types of delivery plans. One is a continuous and the other is a multiple delivery. Also, with the purpose of reducing production completion time and/or machine utilization, the manufacturing firms may adjust production rate or increase the workers’ hours. Therefore, we look into the effect of variations in adjusted rates on system’s optimal policy and various cost components.
The proposed model 2 explores the optimal production cycle for a fabrication system with adjusted rate, scraps, and random breakdown under the abort/resume (AR) policy and scraps. The AR policy means that the machine continues to produce unfinished batches when it has been completely repaired. Finally, numerical examples were used to show applicability and sensitivity analyses for these two models.

並列關鍵字

multi-item ； adjustable production rate ； random breakdown ； scrap ； delivery policies ； common cycle ； production cycle

參考文獻

參考文獻

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